FILTER CIRCUIT, AND RECEIVING DEVICE AND ELECTRONIC DEVICE USING THE FILTER CIRCUIT

摘要

Filter circuit (6) includes Nth-order active filters (8, 9, 10), switching circuit (14) which switches shorting or non-shorting of active filter (9), and power-supply control circuit (15) which controls such that a power supply of active filter (9) is turned off when switching circuit (14) shorts active filter (9). A receiver employing filter circuit (6) turns off the power supply of active filter (9) not needed when no interference wave exists within a given range from a desired frequency band. The foregoing structure allows lowering the power consumption of filter circuit (6).